<?php
/**
 * Smarty Internal Plugin Resource Extends
 *
 * @package    Smarty
 * @subpackage TemplateResources
 * @author     Uwe Tews
 * @author     Rodney Rehm
 */

/**
 * Smarty Internal Plugin Resource Extends
 *
 * Implements the file system as resource for Smarty which {extend}s a chain of template files templates
 *
 * @package    Smarty
 * @subpackage TemplateResources
 */
class Smarty_Internal_Resource_Extends extends Smarty_Resource {

	/**
	 * mbstring.overload flag
	 *
	 * @var int
	 */
	public $mbstring_overload = 0;

	/**
	 * populate Source Object with meta data from Resource
	 *
	 * @param Smarty_Template_Source   $source    source object
	 * @param Smarty_Internal_Template $_template template object
	 */
	public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null) {
		$uid = '';
		$sources = array();
		$components = explode('|', $source->name);
		$exists = true;
		foreach ($components as $component)
		{
			$s = Smarty_Resource::source(null, $source->smarty, $component);
			if ($s->type == 'php')
			{
				throw new SmartyException("Resource type {$s->type} cannot be used with the extends resource type");
			}
			$sources[$s->uid] = $s;
			$uid .= $s->filepath;
			if ($_template && $_template->smarty->compile_check)
			{
				$exists = $exists && $s->exists;
			}
		}
		$source->components = $sources;
		$source->filepath = $s->filepath;
		$source->uid = sha1($uid);
		if ($_template && $_template->smarty->compile_check)
		{
			$source->timestamp = $s->timestamp;
			$source->exists = $exists;
		}
		// need the template at getContent()
		$source->template = $_template;
	}

	/**
	 * populate Source Object with timestamp and exists from Resource
	 *
	 * @param Smarty_Template_Source $source source object
	 */
	public function populateTimestamp(Smarty_Template_Source $source) {
		$source->exists = true;
		foreach ($source->components as $s)
		{
			$source->exists = $source->exists && $s->exists;
		}
		$source->timestamp = $s->timestamp;
	}

	/**
	 * Load template's source from files into current template object
	 *
	 * @param Smarty_Template_Source $source source object
	 *
	 * @return string template source
	 * @throws SmartyException if source cannot be loaded
	 */
	public function getContent(Smarty_Template_Source $source) {
		if (!$source->exists)
		{
			throw new SmartyException("Unable to read template {$source->type} '{$source->name}'");
		}

		$this->mbstring_overload = ini_get('mbstring.func_overload') & 2;
		$_rdl = preg_quote($source->smarty->right_delimiter);
		$_ldl = preg_quote($source->smarty->left_delimiter);
		if (!$source->smarty->auto_literal)
		{
			$al = '\s*';
		}
		else
		{
			$al = '';
		}
		$_components = array_reverse($source->components);
		$_first = reset($_components);
		$_last = end($_components);

		foreach ($_components as $_component)
		{
			// register dependency
			if ($_component != $_first)
			{
				$source->template->properties['file_dependency'][$_component->uid] = array($_component->filepath, $_component->timestamp, $_component->type);
			}

			// read content
			$source->filepath = $_component->filepath;
			$_content = $_component->content;

			// extend sources
			if ($_component != $_last)
			{
				if (preg_match_all("!({$_ldl}{$al}block\s(.+?)\s*{$_rdl})!", $_content, $_open) != preg_match_all("!({$_ldl}{$al}/block\s*{$_rdl})!", $_content, $_close))
				{
					throw new SmartyException("unmatched {block} {/block} pairs in template {$_component->type} '{$_component->name}'");
				}
				preg_match_all("!{$_ldl}{$al}block\s(.+?)\s*{$_rdl}|{$_ldl}{$al}/block\s*{$_rdl}|{$_ldl}\*([\S\s]*?)\*{$_rdl}!", $_content, $_result, PREG_OFFSET_CAPTURE);
				$_result_count = count($_result[0]);
				$_start = 0;
				while ($_start + 1 < $_result_count)
				{
					$_end = 0;
					$_level = 1;
					if (($this->mbstring_overload ? mb_substr($_result[0][$_start][0], 0, mb_strlen($source->smarty->left_delimiter, 'latin1') + 1, 'latin1') : substr($_result[0][$_start][0], 0, strlen($source->smarty->left_delimiter) + 1)) == $source->smarty->left_delimiter . '*')
					{
						$_start++;
						continue;
					}
					while ($_level != 0)
					{
						$_end++;
						if (($this->mbstring_overload ? mb_substr($_result[0][$_start + $_end][0], 0, mb_strlen($source->smarty->left_delimiter, 'latin1') + 1, 'latin1') : substr($_result[0][$_start + $_end][0], 0, strlen($source->smarty->left_delimiter) + 1)) == $source->smarty->left_delimiter . '*')
						{
							continue;
						}
						if (!strpos($_result[0][$_start + $_end][0], '/'))
						{
							$_level++;
						}
						else
						{
							$_level--;
						}
					}
					$_block_content = str_replace($source->smarty->left_delimiter . '$smarty.block.parent' . $source->smarty->right_delimiter, '%%%%SMARTY_PARENT%%%%', ($this->mbstring_overload ? mb_substr($_content, $_result[0][$_start][1] + mb_strlen($_result[0][$_start][0], 'latin1'), $_result[0][$_start + $_end][1] - $_result[0][$_start][1] - +mb_strlen($_result[0][$_start][0], 'latin1'), 'latin1') : substr($_content, $_result[0][$_start][1] + strlen($_result[0][$_start][0]), $_result[0][$_start + $_end][1] - $_result[0][$_start][1] - +strlen($_result[0][$_start][0]))));
					Smarty_Internal_Compile_Block::saveBlockData($_block_content, $_result[0][$_start][0], $source->template, $_component->filepath);
					$_start = $_start + $_end + 1;
				}
			}
			else
			{
				return $_content;
			}
		}
	}

	/**
	 * Determine basename for compiled filename
	 *
	 * @param Smarty_Template_Source $source source object
	 *
	 * @return string resource's basename
	 */
	public function getBasename(Smarty_Template_Source $source) {
		return str_replace(':', '.', basename($source->filepath));
	}

}

?>
